Merv Posted 18July, 2020 Report Share Posted 18July, 2020 The link below outlines a process for checking relay operation. There is a distinction between Black and Red relays (with the latter having a diode and fixed polarity) I have been checking the Red round original relay on my 88 Carrera for the Cruise Control and it does not display these resistance characteristics at all across the 86 (+) and the 85 (-). Nor do the other original relays. On the 86 - 85 I get 60 ohms - and also in the reverse direction. All the other relays are the same except for the Blower relay that shows a lower rating around 12 mili Ohms. I can't imagine all the relays are blown as everything works (except the CC but that is probably something else). Not sure what is right or wrong on this one. https://forums.pelicanparts.com/porsche-911-technical-forum/902531-testing-relays.html Quote Link to comment Share on other sites More sharing options...
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